2016 Toyota Prado Pricing and Specs

There are probably hundreds of reasons for this to occur, starting with the fuel system and including (but not ending with) something to do with the electronics that control modern turbo-diesel engines. Other causes can be clogged EGR valves or faulty injectors. You need to have the vehicle scanned to see if the on-board computer has detected the fault and logged it. But don't rule out something simpler like a fault with the DPF or even a dirty air filter. Either way, black smoke suggests either a problem with the air-fuel mixture or the way it's being burned.

But don't ignore the problem as black smoke from a diesel engine can also mean it's running hot and that can lead to all sorts of problems including internal engine damage. Unlike a petrol engine which will tend to run cooler on a too-rich mixture (too much fuel, not enough air) a diesel running rich can easily run too hot.

White exhaust smoke in a diesel engine is usually the result of a fuel system problem. Possible causes are dirty, worn or leaking fuel-injectors, but a modern common-rail diesel fuel system is pretty complex, so a scan of the vehicle might be a good idea too.

Some owners of these modern diesels have been reporting very short injector lifespan, although some workshops seem to get good results with ultra-sonic injector cleaning. Even then, the problem can recur, and some mechanics reckon brand-new injectors are the only way to go.

Don’t rule out a problem with the engine’s internal seals, the turbocharger and the DPF system, either, as these can all contribute to smoke of various colours at various times.

Start with the owners manual and familiarise yourself with things like finding and using the jack, changing a tyre, checking the engine oil and coolant in the radiator. I wouldn’t worry too much about making temporary repairs on the trip; there are plenty of mechanics that can help you if you strike trouble. There will also be plenty of other tourists who would be only too happy to help a fellow traveller in trouble. Have your car checked before you leave, so everything is in fine working order when you hit the trail. Make a note of the Toyota dealers along your planned route, and if you are going to remote areas make a note of where you will be able to get fuel, and the mechanics along the way who might be able to help you in an emergency.